目前的情况是这样的：我们的机器为金属外壳可触摸到的设备，机器上有220V 的电机， A：机器工作时有一个5V信号需与外壳地接触（利用外壳作一个参考地），以检测机器的工作状态；
原方案是变压器输出两组独立电源，一组给单片机供电，一组给这个5V信号供电，然后通过光耦将这个外部检测电路与单片机电路完全隔离；
现在因为某些原因，直接将两组电源变为了一组，单片机地直接接外壳，直接用IO去检测A处的工作状态。这个变动是否可靠，需要注意什么问题(备注： 机器需要1750V高压测试）？
先谢过大家了！
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探讨PCB中地线与金属外壳地之间的关系
系统地与外壳直连要保证外壳接大地良好，否则很容易跑飞。
系统地与外壳连接处一定要加磁环或磁珠去干扰。
如果连接仅仅是为了测量信号，还可以串电阻进一步阻隔干扰串入。
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一般来说，机器金属外壳在设计时是一定会连接到三插插头接到大地的。
但是这个机器的主板单片机地也也接要接到外壳上，按之前的经验，这个外壳弄不好会有很高电压的感应电，（用户插座接线不规范时）。直接接到单片机地，会不会乱动作，甚至会打坏芯片， 这个机器生产时还要打高压，是不是也很大概率搞坏芯片。
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| 我们公司的产品（户外设备）设计规定：所有PCB 的GND不得与设备的外壳相连，一般是中间串联电容或者是电阻； 如果GND和大地相连，客户大地不良时，烧一大堆IC（超过1000片） |
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5楼
感谢楼主的分享，很实用了。
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6楼
感谢楼主的分享，很实用了。
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谢谢分享
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